Kaweco piston converter for Kaweco Sport fountain pens. A miniature piston converter allowing the use of bottled inks with many compact fountain pens that can normally only use short international standard cartridges.

Visconti deluxe converter allows the use of bottled ink instead of cartridges. The screw mechanism allows bottled fountain pen ink to be drawn up into the body of the converter which then functions just like a cartridge. Suitable ...